If it's worth saying, but not worth its own post, then it goes here.
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Marginal: ints 2 to 98 with just 2 divisors
("ints" is only vaguely English; "just" is fine here, but debatable if you don't exclude 1.)
Also marginal: "numbers" instead of "naturals". Less precise, but there's only one sensible interpretation.
I like your solution. Agree with you on all your points, too.
Can you do even better?